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run code in 150+ php & hhvm versions
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<?php $str = 'a,b\\\\\\,c,d'; preg_match_all('/(?:\\.|[^,]+)/', $str, $matches); var_dump($matches[0]);
based on DA4VF
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(1) "a" [1]=> string(4) "b\\\" [2]=> string(1) "c" [3]=> string(1) "d" }
Output for hhvm-3.10.0

Process exited with code 153.